[6.2, SE-0456, -0467] enable span properties for inline-storage types

stdlib/public/core/CollectionOfOne.swift

@@ -166,7 +166,22 @@ extension CollectionOfOne {
     @lifetime(borrow self)
     @_alwaysEmitIntoClient
     get {
-      fatalError("Span over CollectionOfOne is not supported yet.")
+      let pointer = unsafe UnsafePointer<Element>(Builtin.addressOfBorrow(self))
+      let span = unsafe Span(_unsafeStart: pointer, count: 1)
+      return unsafe _overrideLifetime(span, borrowing: self)
+    }
+  }
+
+  @available(SwiftStdlib 6.2, *)
+  public var mutableSpan: MutableSpan<Element> {
+    @lifetime(&self)
+    @_alwaysEmitIntoClient
+    mutating get {
+      let pointer = unsafe UnsafeMutablePointer<Element>(
+        Builtin.addressOfBorrow(self)
+      )
+      let span = unsafe MutableSpan(_unsafeStart: pointer, count: 1)
+      return unsafe _overrideLifetime(span, mutating: &self)
     }
   }
 }

stdlib/public/core/InlineArray.swift

@@ -468,7 +468,20 @@ extension InlineArray where Element: ~Copyable {
     @lifetime(borrow self)
     @_alwaysEmitIntoClient
     borrowing get {
-      fatalError("Span over InlineArray is not supported yet.")
+      let pointer = unsafe _address
+      let span = unsafe Span(_unsafeStart: pointer, count: count)
+      return unsafe _overrideLifetime(span, borrowing: self)
+    }
+  }
+
+  @available(SwiftStdlib 6.2, *)
+  public var mutableSpan: MutableSpan<Element> {
+    @lifetime(&self)
+    @_alwaysEmitIntoClient
+    mutating get {
+      let pointer = unsafe _mutableAddress
+      let span = unsafe MutableSpan(_unsafeStart: pointer, count: count)
+      return unsafe _overrideLifetime(span, mutating: &self)
     }
   }
 }

test/abi/macOS/arm64/stdlib.swift

@@ -846,6 +846,8 @@ Added: _$sSs8UTF8ViewV4spans4SpanVys5UInt8VGvpMV
 Added: _$sSa11mutableSpans07MutableB0VyxGvr
 Added: _$ss10ArraySliceV11mutableSpans07MutableD0VyxGvr
 Added: _$ss15ContiguousArrayV11mutableSpans07MutableD0VyxGvr
+Added: _$ss11InlineArrayVsRi__rlE11mutableSpans07MutableD0Vyq_Gvr
+Added: _$ss15CollectionOfOneV11mutableSpans07MutableE0VyxGvr
 
 // _SwiftifyInfo enum for _SwiftifyImports macro
 Added: _$ss13_SwiftifyExprO5paramyABSicABmFWC

test/abi/macOS/x86_64/stdlib.swift

@@ -847,6 +847,8 @@ Added: _$sSs8UTF8ViewV4spans4SpanVys5UInt8VGvpMV
 Added: _$sSa11mutableSpans07MutableB0VyxGvr
 Added: _$ss10ArraySliceV11mutableSpans07MutableD0VyxGvr
 Added: _$ss15ContiguousArrayV11mutableSpans07MutableD0VyxGvr
+Added: _$ss11InlineArrayVsRi__rlE11mutableSpans07MutableD0Vyq_Gvr
+Added: _$ss15CollectionOfOneV11mutableSpans07MutableE0VyxGvr
 
 // _SwiftifyInfo enum for _SwiftifyImports macro
 Added: _$ss13_SwiftifyExprO5paramyABSicABmFWC

test/stdlib/Span/InlineSpanProperties.swift

@@ -23,7 +23,6 @@ var suite = TestSuite("Span properties backed by inline storage")
 defer { runAllTests() }
 
 suite.test("CollectionOfOne.span property")
-.skip(.wasiAny(reason: "Trap tests aren't supported on WASI."))
 .skip(.custom(
   { if #available(SwiftStdlib 6.2, *) { false } else { true } },
   reason: "Requires Swift 6.2's standard library"
@@ -35,15 +34,13 @@ suite.test("CollectionOfOne.span property")
   let u = Array(s.utf8)
   let c = CollectionOfOne(consume s)
   s = ""
-  expectCrashLater()
   let span = c.span
   expectEqual(span.count, 1)
   let v = Array(span[0].utf8)
   expectEqual(u, v)
 }
 
 suite.test("CollectionOfOne.span property (simple)")
-.skip(.wasiAny(reason: "Trap tests aren't supported on WASI."))
 .skip(.custom(
   { if #available(SwiftStdlib 6.2, *) { false } else { true } },
   reason: "Requires Swift 6.2's standard library"
@@ -52,7 +49,6 @@ suite.test("CollectionOfOne.span property (simple)")
   guard #available(SwiftStdlib 6.2, *) else { return }
 
   let c = CollectionOfOne(Int.random(in: 0..<100000))
-  expectCrashLater()
   let span = c.span
   expectEqual(span.count, c.indices.count)
   expectEqual(span[0], c[0])
@@ -63,7 +59,6 @@ struct Padded: BitwiseCopyable {
 }
 
 suite.test("CollectionOfOne.span stride test")
-.skip(.wasiAny(reason: "Trap tests aren't supported on WASI."))
 .skip(.custom(
   { if #available(SwiftStdlib 6.2, *) { false } else { true } },
   reason: "Requires Swift 6.2's standard library"
@@ -72,14 +67,25 @@ suite.test("CollectionOfOne.span stride test")
   guard #available(SwiftStdlib 6.2, *) else { return }
 
   let c = CollectionOfOne(Padded(storage: (-1, 1)))
-  expectCrashLater()
   let span = c.span
   let bytes = span.bytes
   expectEqual(bytes.byteCount, MemoryLayout.size(ofValue: c))
 }
 
+suite.test("CollectionOfOne.mutableSpan property (simple)")
+.require(.stdlib_6_2).code {
+  guard #available(SwiftStdlib 6.2, *) else { return }
+
+  var c = CollectionOfOne(Int.random(in: 0..<100000))
+  expectEqual(c.count, 1)
+  var span = c.mutableSpan
+  expectEqual(span.count, 1)
+  span[0] = Int.random(in: .min..<0)
+  let r = span[0]
+  expectEqual(c[0], r)
+}
+
 suite.test("InlineArray.span property")
-.skip(.wasiAny(reason: "Trap tests aren't supported on WASI."))
 .skip(.custom(
   { if #available(SwiftStdlib 6.2, *) { false } else { true } },
   reason: "Requires Swift 6.2's standard library"
@@ -89,7 +95,6 @@ suite.test("InlineArray.span property")
 
   var s = InlineArray<5, Int>(repeating: 0)
   s[3] = .random(in: 0..<1000)
-  expectCrashLater()
   let span = s.span
   expectEqual(span.count, s.count)
   for i in s.indices {
@@ -98,7 +103,6 @@ suite.test("InlineArray.span property")
 }
 
 suite.test("InlineArray.span property (String)")
-.skip(.wasiAny(reason: "Trap tests aren't supported on WASI."))
 .skip(.custom(
   { if #available(SwiftStdlib 6.2, *) { false } else { true } },
   reason: "Requires Swift 6.2's standard library"
@@ -108,10 +112,37 @@ suite.test("InlineArray.span property (String)")
 
   var s = InlineArray<5, String>(repeating: "0")
   s[3] = String(Int.random(in: 0..<1000))
-  expectCrashLater()
   let span = s.span
   expectEqual(span.count, s.count)
   for i in s.indices {
     expectEqual(span[i], s[i])
   }    
 }
+
+suite.test("InlineArray.mutableSpan property")
+.require(.stdlib_6_2).code
+{
+  guard #available(SwiftStdlib 6.2, *) else { return }
+
+  var v = InlineArray<5, Int>(repeating: 0)
+  let c = v.count
+  var span = v.mutableSpan
+  expectEqual(span.count, c)
+  span[3] = Int.random(in: .min..<0)
+  let r = span[3]
+  expectEqual(v[3], r)
+}
+
+suite.test("InlineArray.mutableSpan property (String)")
+.require(.stdlib_6_2).code
+{
+  guard #available(SwiftStdlib 6.2, *) else { return }
+
+  var v = InlineArray<5, String>(repeating: "0")
+  let c = v.count
+  var span = v.mutableSpan
+  expectEqual(span.count, c)
+  span[3] = String(repeating: "0", count: Int.random(in: 100..<500))
+  let s = span[3]
+  expectTrue(s._isIdentical(to: v[3]))
+}